<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        function wait(n) {
            return new Promise((res) => {
                setTimeout(() => {
                    res('等待了' + n + '秒')
                }, n)
            })
        }
        wait(1000).then(res=>console.log(res))
    </script>
</body>

</html>